Ladder



Patented iblov 5, i923.

srares JDSEF GRNDEL, OF NEW YORK, El'. Y.

epiincation fu@ August s, i922. sensi no. ares-ai.

'/'o nl] 'ir/mm it may concevoir.'

lle it known that l. Josue- GnNnrL, a citizen oi (lei-many. and residentof the city of New York. in the county of New York and State of NewYork. have invented Certain new and useful improvements in Ladders, oiwhich the t'ollowinpy is a specification.

The present invention relates to ladders and more particularly ot theclass known as knockdown ladders.

The main object of the invention is to provide a ladder, the runes andStiles of which may be conveniently separated and the ladder taken apartand readily reassembled without the use ot additional fastening means,each stile being made of a. plurality of separable sect-ions none otwhich extends ay greater distance than from one rung to another.

Another objectI ot the invention is to provide a ladder or the typementioned which is simple in construction, efiicient in operation,durable in use and capable ot manufacture on a'commercial scale, or inother words one which is not so ditlicult to make as to be beyond thereasonable cost of such a contrivance.

With these and other objects in view, which will more fully appear asthe nature of the rinvention is better understood, the same consists inthe combination, arrangement. and construction of parts hereinafterdescribed, pointed, out in the appended claim and villustrated in theaccompanying drawings, it being1 understood that many changes may bemade in the size and proportion of the several parts and details ofconstructionwithin the scope of the appended claim` without departingfrom the spirit or sacrificing any of the advantages of the invention.

Une of the many possible embodiments of the invention is illustrated inthe accompartyingl drawings. in which v Figure 1 is aV side elevation oftwo seetions of one stile of a ladder, constructed in accordance withthe present invention; Fig'. 2 is a front elevation thereof; and Fig'. 3is a section taken o-n line 3-3 of Fig. 1.

Each or' the Stiles of the ladder is composed of a plurality oit'sections-10. all of which are alike in construction. Each stile sectionis joined with the next in the series by groove and tongue joints,separation of the sections being prevented, as will herein after appear,by the rungs 11. Each stile section isl provided in its upper'-horizontal edge with a` tongue 12 and in its lower hori zontal edge witha tongue 13, the tongue 12 extending horizontally from the longituloweredge of 'the mortise in alignment with` the tongue 13, said grooveextending from the longitudinal edge 15 of the stile section toward theedge 14 and communicating with the bottom of the mortise 17 and beingDof a size adapted to receive the tonvue 13 of the next section in theseries. there is removed from the lower horizontal edge upwards alongitudinal portion of the stile section along the longitudinal edge 1Athereof, as indicated at 19, there being an oblong mortise 20 formed inthe structure remainingl a substantial distance above the lowerhorizontal edge of the stile seotionL- A horizontal groove 21 is cutbelow theupper edge of the mortise 2O in alignment with the tongue 12,said groove extending' lfrom oimilarly,

the longitudinal edge let od the mile section toward the edge 15 andcommunicating with the top'o said mortise` and being of a size adaptedto receive the tongue 12 of the next section in the series. The portions10 oit each section between the tongues 12` 13 and cut out edges 16,a'nd19 respectively. form tenons which engage respectively in the top andbottom portions of the mortises 20 and 1-7. Tenon and mortise jointsalined with the tongue and groove joints being thusl provided When theparts are assembled. Y

In assembling two sections of a stile,the upper portion of one is placedinto the recess 20 of the other, whereby the tongue 12 of the t'ormerisbrought into registerinu' position with the groove 21 of the other, thetongue 13 of the seeond-mentioned ses lil@ .no 'y tion is brought intoalignment with the groove lh! ot' the first-mentioned seetion. (hieseetion is then shifted longitudinally in relationto the other.wlierehlv the eorrespondiingr groovesy and tonggut` are interloeked.'Vt'hen thtJ eleinent l are in lhe=e po- S'itioi'is. they rannot mmelaterally in relation to one another hy reason ot' the l'aet. that thetongues l2 and 155 do not extend throughout the widths of the styileseetion, ltA is also to he noted that when the elements arel thmassenihled. the inortises in the adjoiningr e'uls thereotl forni anohlontr slot 22. When the end of a rung l1 is inserted into this slot,it prevents longitudinal `movement; of the stile lQeetions in relationto one another. holdin;- thus the l@tile set-tions in operative relationwithout the use of additional 'fastening meansh From this it appearsthat the runes art as wedges. forcing the styile sections longitudinallyin oppositie directions.

What l claim is:-

Atltnoekdown ladder Comprising Stiles, eaeh inade oia plurality ofset-tions, the ineeiint ends ol' adjoinii'izg` sei-tions being provided'with tongue and groove joints extendineV only through part ol the widthof said seetions. .said joints heiner disposed on orposite edges of thestile und spared long fitudinally thereof. said inenting ends heinerfurther provided intermediate said tongue and `groove joints with alinedtenon and niortise jointsthe opposed ends of the renoml on the twosections heilig' spaced to provide a slot. and a runtr end inserted intosaid slot Serving' for directly connectingT the seetions of the `stileund preventing*r their longit'udinal movement in relation to oneanother,

Signed at New York, in the eount \v oi'V New York and State of NewvYork. this 22nd day of June,' A. D. 1922.

JO EF GRNDICL.

